Perhaps. But that doesn't mean the thing missing is overly necessary. At least in any kind of official published sense. Homebrew away. Make something you and your players will enjoy. But demanding that WotC publish every possible thing just because a few people are asking for it is, quite frankly, impractical.
WotC already gave us what they think 5e needs to represent the aspects and flavor of the warlord. That it is not enough for some, adequate for most, and too much for some, to me sounds like it's probably just right.